Everyone planning their first pub quiz makes the same mistake. They count the questions, multiply by "about a minute", and announce a finish time. Then the night overruns by forty minutes, the kitchen has closed, and half the room left before the results. The error is not in the multiplication. It is that answering a question is the cheapest part of asking one. You read it out. Someone at the back says "what?". You read it again. A table argues. You wait. Then you read the answers out at th...